EP0947951B1 - Dispositif de télétransmission par couplage inductif - Google Patents

Dispositif de télétransmission par couplage inductif

Info

Publication number
EP0947951B1
EP0947951B1 EP99400755A EP99400755A EP0947951B1 EP 0947951 B1 EP0947951 B1 EP 0947951B1 EP 99400755 A EP99400755 A EP 99400755A EP 99400755 A EP99400755 A EP 99400755A EP 0947951 B1 EP0947951 B1 EP 0947951B1
Authority
EP
European Patent Office
Prior art keywords
voltage
antenna
transistor
rectifier
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99400755A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0947951A1 (fr
Inventor
Thierry Thomas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0947951A1 publication Critical patent/EP0947951A1/fr
Application granted granted Critical
Publication of EP0947951B1 publication Critical patent/EP0947951B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs

Definitions

  • the invention relates to a teletransmission device for portable objects (card, ticket, tag, etc.) linked by inductive coupling to a fixed station (of the card reader type, label interrogator, etc.).
  • a "fixed station” is an interrogator, or a reader, or any type of receiver whose congestion is relatively large and which has its own power supply means, which are generally conventional electrical devices.
  • a "portable object” is a memory card, or a tag, or any type of transponder of small size, which must use a very restrictive autonomous power source to send data to the fixed station.
  • the size of the portable objects is generally reduced, for example in the format of a credit card.
  • the portable object can be active, that is, it contains its own power source, such as a battery or battery, or it can be passive, i.e. it is remote powered.
  • a remotely powered portable object draws its energy from the fixed station by means of the inductive coupling which, in these systems, is achieved by means of antennas of the conductive circuit windings type. Consequently, the portable object is no longer powered when it leaves the electromagnetic field of the fixed station, that is to say when the nominal coupling conditions are no longer met.
  • a data exchange system therefore generally comprises a fixed station 1 and one or more portable object (s). (s) 10; the fixed station 1 comprises a set of electronic circuits, referenced 2, coupled to two antenna coils 3 and 4. One of the antenna windings (coil 4) emits an alternating magnetic field which makes it possible to send information intended to to the portable object 10.
  • a second antenna coil 3 ensures the collection of a signal induced by the emission secondary caused by the current induced in the antenna of the portable object.
  • the fixed station comprises two antennas: one for reception, the other for transmitting messages; however, it is possible to use a single antenna to perform both functions.
  • the portable object 10 comprises a set of electronic circuits 11 connected to the terminals of an antenna coil 12.
  • a capacitor 13 is connected in parallel to the terminals of the antenna 12 of to form a resonant circuit.
  • US Pat. No. 5,721,535 represents in FIG. 1 an example of such an embodiment, the equivallent of the circuit 11 having the reference 110.
  • the fixed station emits a high amplitude alternating magnetic field in a volume of space chosen according to the intended application; the portable object interacts on this magnetic field by means of its antenna by emitting a secondary magnetic field by LENZ law, according to the impedance of the circuits connected on this antenna. In return, this secondary field induces a detectable voltage in the antenna of the fixed station.
  • Such a method of data exchange is described, for example, in US-A-3,299,424 or in WO 97/05504.
  • these patents describe a data exchange system in which the portable object is remotely powered and comprises a single antenna coil.
  • the means for transmitting information from the portable object to the fixed station consists of a series impedance with a switch, the assembly being connected to the terminals of the antenna.
  • the impedance of the circuits connected to the winding of the antenna is thus modulated, as is the secondary magnetic field and, consequently, the associated voltage induced in the antenna of the fixed station.
  • this patent describes the use of a capacitor associated with the winding of the antenna of the portable object, so as to obtain a parallel inductance-capacitance resonant circuit, the purpose of which is to increase the voltage across the terminals. the antenna by overvoltage with respect to the induced electromotive force (EMF) in the winding and to increase the effect induced back in the antenna winding of the fixed station, due to the presence of the portable object.
  • EMF induced electromotive force
  • patent EP-0 204 542 describes a system which comprises voltage recovery means made using two diodes, the middle of the winding of the antenna being connected to the reference zero of the assembly.
  • the rectifying means are made from a bridge with four diodes, namely the GR ⁇ ETZ bridge, or by MOS transistors wired in diodes (that is to say transistors whose gate is connected to the drain).
  • MOS transistors wired in diodes (that is to say transistors whose gate is connected to the drain).
  • the patent WO 97/05504 describes a data exchange system which comprises a voltage tripler rectifier, as well as a modulation function which acts on the antenna of the portable object, itself associated with a capacitor in parallel. to form a resonant circuit.
  • the systems described in US Pat. Nos. 4,196,418 and 2,623,311, already cited above, furthermore comprise a function for stabilizing the rectified voltage, added to the remote power supply function described above.
  • This function of stabilizing the rectified voltage is performed by a simple electronic component, namely a ZENER diode.
  • the electromotive force induced in the winding of the antenna of the portable object is proportional to the mutual coupling coefficient between this winding and that of the antenna of the fixed station, this coupling coefficient being able to vary within a large range. values corresponding to the flexibility of the contactless operation sought.
  • the voltage available at the terminals of the portable object is function of this electromotive force, the internal impedance of the antenna and the load connected to it.
  • a ZENER diode makes it possible, by virtue of its nonlinear voltage-current characteristic, to simply stabilize the rectified voltage.
  • the stabilization function of the rectified voltage can also be realized by means of an electronic arrangement, composed of a voltage reference, a differential amplifier and a controlled resistor (for example, a transistor).
  • This electronic arrangement generally called “SHUNT regulator”
  • SHUNT regulator ensures the adaptation of the load connected to a voltage generator having a significant internal impedance, so as to regulate the output voltage of this generator to a given value; the voltage generator may be, for example, an antenna associated with a rectifier.
  • the modulation function is performed by a switch which bypasses the antenna, or by a switch in series with a capacitance, the assembly being connected to the terminals of the antenna to modify its resonance frequency.
  • the modulation function is performed by a switch in series with a resistor, which allows to act on the quality coefficient of the antenna without changing the resonance frequency.
  • This type of modulation function is described, for example, in EP-A2-0 204 542 and WO 97/05504.
  • modulation functions are realized by means of a diode, or a ZENER diode, or an inductor.
  • the modulation is compatible with the SHUNT control function; on the other hand, it reacts in such a way as to compensate for the possible modification of the voltage available at the terminals of the antenna, which causes a concomitant charge modulation, except if the excursion of the modulation of the resonance frequency is symmetrical with respect to at the frequency of the magnetic field emitted by the fixed station, as described in patent EP-A-0 198 642. In this case, the dissipation of the energy of the portable object remains the same for the two binary states of the modulation.
  • the double modulation on the resonance frequency and, involuntarily, on the quality coefficient, makes it difficult to detect this modulation at the fixed station.
  • FIG. 2 shows an example of regulation means and modulation means, for the sake of simplification, on the same diagram of a teletransmission device, knowing an association as illustrated is not usable.
  • the elements of the portable object already described in Figure 1 namely: the antenna 12 connected in parallel to the capacitor 13, and the set of electronic circuits 11.
  • These electronic circuits comprise a rectifier of voltage 15 (which may be, as shown in FIG. 2, a GR ⁇ ETZ bridge), modulation means 18, a voltage regulator 16 and a storage capacitor 17 intended to supply a regulated voltage Vdd to supply all of the electronic circuits.
  • the regulator 16 is a SHUNT regulator, as previously described; it comprises a transistor 16a, a differential amplifier 16b and a voltage reference 16c.
  • the modulator 18 is produced by an impedance 18b in series with a switch transistor 18a, this impedance-transistor assembly being connected to the terminals of the antenna 12.
  • the switch 18a is controlled by a digital signal transmitted by the voltage line 18c, via the gate of the transistor. This digital signal represents the message to be transmitted in the form of serial binary data.
  • the transmission of data from the portable object to the fixed station can be interpreted as the modulation of one or more of the parameters of a resonant circuit of the inductance-capacitance-resistance type.
  • These parameters are the resonance frequency and the quality coefficient of the assembly, that is to say the resonant antenna (formed by the assembly 12, 13) charged by the electronic circuits 11.
  • the energy dissipated in subject Portable is taken on the energy supplied to the antenna of the fixed station to emit the magnetic field.
  • a variation of the quality coefficient of the portable object therefore results in a variation of energy at the fixed station, whereas a variation of the resonance frequency of the portable object introduces a variation of the phase of the field.
  • the operation of the SHUNT regulator is incompatible with a variation modulation of the quality coefficient, since the SHUNT regulator 16 will compensate for the charge change caused by the modulator 18 and, therefore, cancel the desired effect.
  • the object of the invention is precisely to solve the disadvantages of the techniques described above. To this end, it proposes a device for teletransmission by inductive coupling between a portable object and a fixed station.
  • the modulation function acts on the antenna of the portable object while remaining compatible with the remote power supply functions and ensures the creation of a detectable signal in the antenna from the fixed station.
  • the teletransmission device of the invention makes it possible to obtain a modulation of the load of the antenna, that is to say a modulation of the quality coefficient of the whole object. portable, while remaining compatible with the SHUNT control function described above.
  • This device also makes it possible to obtain a load modulation rate that can be adjusted or fixed, in advance, during the definition of the elements of the electronic circuit of the portable object.
  • the voltage across the antenna is the sum of a regulated voltage and a modulated voltage determined by the values chosen for the modulation means.
  • the electronic dipole may be a diode, or a ZENER diode, or a MOS transistor whose gate is connected to the drain.
  • the voltage regulator comprises a transistor whose drain and source are connected to outputs of the rectifier and a differential amplifier whose output is connected to the gate of the transistor and whose inputs receive, on the one hand, a reference voltage and, on the other hand, the voltage of the supply line.
  • the voltage regulator comprises a transistor connected in parallel to the terminals of the antenna and a differential amplifier whose output is connected to the gate of the transistor and whose inputs receive, on the one hand, a reference voltage and, on the other hand, the voltage of the feeder.
  • the voltage regulator comprises a first transistor connected in parallel to the terminals of the antenna, a second transistor connected at the output of the rectifier and a differential amplifier whose inputs receive, from a on the other hand, the voltage of the supply line and whose output is connected to a distribution circuit, itself connected to the gates of the first and second transistors.
  • the invention relates to a remote transmission device for a remotely powered portable object.
  • This device comprises a rectifier associated with a SHUNT regulator as well as modulation means which act on the antenna of the portable object while remaining compatible with the remote power supply functions (rectifier + regulator SHUNT) of the portable object and to create a detectable signal in the antenna of the fixed station.
  • rectifier + regulator SHUNT remote power supply functions
  • modulation means consist of a transistor associated with an electronic dipole ensuring a voltage drop between the input and the output of these modulation means; this transistor / dipole assembly is connected to the input of the voltage regulator so as to ensure control of the voltage across the antenna.
  • the connections between these modulation means, the rectifier and the SHUNT regulator can be realized according to several embodiments.
  • the portable object comprises an antenna 12 formed by a coil in a conductive circuit, at the terminals of which may be connected a capacitor 13, thereby forming a resonant circuit.
  • a voltage rectifier 15 is connected in parallel to the terminals of the antenna 12 to ensure the transformation of the alternating voltage received by the antenna 12 in DC voltage, carried by the supply line Vdd to the processing and storage means 14.
  • the rectifier 15 may be a GR ⁇ ETZ bridge which is connected to the two terminals of the winding 12 by the connection points 15a and 15c.
  • the connection point 15b of the rectifier is connected directly to the output line Vss of the device.
  • This modulator 18 comprises an electronic dipole 18b connected in parallel with a switching transistor 18a.
  • This switch assembly 18a and dipole 18b is connected in series on the supply line Vdd, between the output point Vr of the rectifier 15 and the input point Ve of the differential amplifier 16b, which will be described in more detail by the after ; the voltage carried at this input Ve (with respect to the ground point Vss) is the regulated voltage Vdd.
  • the electronic dipole 18b of the modulator 18 is chosen so that it introduces a voltage drop Vr-Vdd between the points 18c and 18d of the modulator, when the transistor 18a is open; when this transistor 18a is closed, the voltage drop introduced by the modulator 18 must be lower and, preferably, negligible.
  • the relative variation of the quality coefficient of the portable object is equal to the relative variation of the voltage thus obtained at the output of the rectifier, provided that the voltage drop across the diodes of the rectifier is neglected. 15.
  • the regulated voltage Vdd is regulated to a value of 4 volts and if the modulation circuit 18 introduces a series voltage of 1 volt when the transistor 18a is open, and 0 volt when it is closed, then the ratio between the value deviation and the maximum value, called the modulation depth of the quality coefficient, will be about 20%.
  • the electronic dipole 18b is a non-linear current-voltage characteristic element, such that the voltage at its terminals is substantially constant, which makes it possible to maintain the modulation depth of the quality coefficient of the portable object at a virtually constant value.
  • the electronic dipole 18b may be a resistor, or a diode, or a ZENER diode, or a transistor in which the gate is connected to the drain.
  • the electronic dipole 18b may also consist of a plurality of diodes associated in series.
  • the voltage drop between the points 18c and 18d is a function of the current flowing on the supply line Vdd.
  • the regulator 16 is associated with a capacitor 17 connected between the supply line Vdd and the output line Vss, so as to provide a stabilized voltage Vdd at the point Ve.
  • the regulator 16 comprises a differential amplifier 16b associated with a transistor 16a.
  • This transistor 16a has its drain and its source connected, respectively at the supply line Vdd and at the output voltage line Vss of the device.
  • the gate of the transistor 16a is connected to the output of the differential amplifier 16b, the latter receiving on its negative input a reference voltage Vref, referenced 16c, and on its positive input, the voltage at the point Ve which corresponds to the voltage regulated circulating on the supply line Vdd.
  • the regulator 16 is connected at the output of the resonant circuit formed by the antenna 12 and the capacitor 13.
  • This regulator 16 comprises, as in the previous embodiment, a transistor 16a connected to the circuit resonant 12-13 by its drain and its source.
  • the gate of this transistor 16a is connected to the output of the differential amplifier 16b of the regulation circuit 16 which itself receives, on its positive terminal, the voltage flowing on the supply line Vdd and, on its negative terminal, a reference voltage Vref. from a voltage generator 16c.
  • the gate of the transistor 16a is also connected to the input of an amplifier 19 belonging to the demodulation circuit which will not be described more precisely because similar to the other demodulation circuits conventionally used on portable objects.
  • the modulator 18 which consists, as in the previous embodiment, of an electronic dipole 18b connected in parallel with a switching transistor 18a, is connected in series between the output 15d of the rectifier 15 and the connection point Ve. In other words, the modulator is connected in series on the supply line Vdd of the device.
  • the data coming from the fixed station and intended for the portable object is transmitted by modulation of the magnetic field emitted by the antenna of the fixed station.
  • This magnetic field modulation causes a modulation of the electromagnetic force induced in the antenna coil 12 of the portable object; the SHUNT controller 16 reacts to this modulation to regulate the remote power supply voltage Vdd. It is then advantageous to use the control signal of the transistor 16a to detect and demodulate the data coming from the fixed station.
  • FIG. 5 diagrammatically shows a third embodiment of the device of the invention.
  • the transistor 16a of the regulator 16 is connected identically to the circuit of FIG. 4, that is to say in parallel between the two terminals of the resonant circuit 12/13, and the Rectifier 15 is connected, via its terminals 15a and 15c, in parallel to the capacitor 13 and, via its terminal 15d, in series on the modulator 18.
  • the modulator 18 comprises an electronic dipole 18b connected in parallel to a switching transistor 18a, the assembly being connected in series on the supply line Vdd between the output 15d of the rectifier 15. and the connection point Ve.
  • the regulator comprises, in addition to the transistor 16a connected in parallel on the resonant circuit 12/13, a second transistor 16d mounted parallel to the outputs 15b and 15d of the regulator 15.
  • this transistor 16d is connected between the supply line Vdd and the output line Vss of the device.
  • the gate of each of the transistors 16a and 16d is connected to an additional circuit 16e, called a distribution circuit, whose role is to distribute the control voltage from the differential amplifier 16b between one or other of the transistors 16a. and 16d.
  • the first transistor 16a makes it possible, in fact, to control the majority of the current required for regulation and the second transistor 16b makes it possible to drive smaller current variations, but more rapidly.
  • Such a SHUNT regulator therefore has the advantage of meeting fast reaction needs such as, for example, during a transfer of high throughput data.
  • FIG. 6 shows another remote transmission device, in which the modulation of the output voltage of the rectifier 15 is obtained for a different arrangement of the modulator 18 from that of the three previous embodiments.
  • the regulator 16 comprises a transistor 16a whose drain and source are connected to the resonant circuit 12/13 and whose gate is connected to the output of the differential amplifier 16b.
  • This differential amplifier receives, on its negative terminal, the reference voltage Vref. and on its positive terminal, the voltage coming from the modulator 18.
  • the modulator 18 comprises a transistor 18a and an electronic dipole 18b connected in series with each other and connected to the negative terminal of the differential amplifier 16b, via a divider bridge 20a / 20b.
  • the modulator 18 acts directly on an input of the differential amplifier 16b, modulating the division ratio of the divider bridge 20a / 20b supplied by the rectified voltage supplied by the supply line Vdd.
  • the regulator 16 loses its regulating function; a second regulator, referenced 21, is thus placed on the supply line Vdd, between the points Va and Vb, which are the connection points of two capacitors 17a and 17b connected, in parallel with each other, between the supply line Vdd and the output line Vss of the device; the role of these two capacitors 17a and 17b connected in parallel is identical to that of the storage capacitor 17 of FIGS. 3, 4 and 5.
  • the device of FIG. 6 has the advantage of allowing an adjustable depth of modulation by a choice of the values of the resistors 20a, 20b forming the divider bridge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Near-Field Transmission Systems (AREA)
EP99400755A 1998-03-31 1999-03-29 Dispositif de télétransmission par couplage inductif Expired - Lifetime EP0947951B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9803962A FR2776865B1 (fr) 1998-03-31 1998-03-31 Dispositif de teletransmission par couplage inductif
FR9803962 1998-03-31

Publications (2)

Publication Number Publication Date
EP0947951A1 EP0947951A1 (fr) 1999-10-06
EP0947951B1 true EP0947951B1 (fr) 2006-10-04

Family

ID=9524682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99400755A Expired - Lifetime EP0947951B1 (fr) 1998-03-31 1999-03-29 Dispositif de télétransmission par couplage inductif

Country Status (5)

Country Link
US (1) US6778070B1 (ja)
EP (1) EP0947951B1 (ja)
JP (1) JP4584373B2 (ja)
DE (1) DE69933405T2 (ja)
FR (1) FR2776865B1 (ja)

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6199757B1 (en) 2000-02-01 2001-03-13 Profold, Inc. Debit card having scratch-off label strip and method of applying same
AU2001231266A1 (en) * 2000-02-01 2001-08-14 Profold, Inc. Debit card having secure scratch-off label strip and method of applying same
US20030169169A1 (en) * 2000-08-17 2003-09-11 Luc Wuidart Antenna generating an electromagnetic field for transponder
EP1461768B1 (en) * 2001-12-24 2005-11-16 Koninklijke Philips Electronics N.V. Transponder
ATE415668T1 (de) * 2002-02-01 2008-12-15 Nxp Bv Anpassung der spulenspannung eines transponders an die feldstärke
DE10206137A1 (de) * 2002-02-14 2003-09-04 Infineon Technologies Ag Etikettenkennsystem und dafür geeignetes Codierverfahren
AU2003217825A1 (en) * 2002-02-28 2003-09-16 Lynk Labs, Inc. One wire self referencing circuits for providing power and data
FR2853479A1 (fr) * 2003-04-07 2004-10-08 Commissariat Energie Atomique Dispositif de teletransmission par couplage inductif a modulation multiniveaux
US7880588B2 (en) * 2003-12-05 2011-02-01 Stmicroelectronics S.A. Resistive and capacitive modulation in an electromagnetic transponder
DE102004013177B4 (de) * 2004-03-17 2006-05-18 Infineon Technologies Ag Datenübertragungseinheit mit einer Datenübertragungsschnittstelle und ein Verfahren zum Betreiben der Datenübertragungseinheit
FR2875976B1 (fr) * 2004-09-27 2006-11-24 Commissariat Energie Atomique Dispositif et procede de communication sans contact securisee
FR2879754A1 (fr) 2004-12-20 2006-06-23 St Microelectronics Sa Transpondeur electromagnetique depourvu d'alimentation autonome
DE102006006912A1 (de) * 2006-02-15 2007-08-30 Atmel Germany Gmbh Verfahren zur Spannungsbegrenzung bei einem Transponder
DE502007002450D1 (de) * 2006-02-15 2010-02-11 Atmel Automotive Gmbh Verfahren zur Spannungsbegrenzung bei einem Transponder
FR2900752B1 (fr) * 2006-05-05 2008-10-10 Inside Contactless Sa Procede et dispositif de transmission de donnees par modulation de charge
FR2901061B1 (fr) * 2006-05-12 2008-11-14 Centre Nat Rech Scient Convertisseur d'onde electromagnetique en tension continue
EP2089732A2 (en) * 2006-11-27 2009-08-19 Nxp B.V. A magnetic field sensor circuit
DE102007019672B4 (de) * 2006-12-27 2017-07-27 Ifm Electronic Gmbh Sende- und Empfangsvorrichtung für ein Funkerkennungssystem
DE102007004843A1 (de) * 2007-01-31 2008-08-07 Infineon Technologies Ag Konzept zum Bereitstellen einer Versorgungsspannung und einer Lastmodulation in einem Transponder
DE102007040855B4 (de) * 2007-08-29 2018-01-11 Texas Instruments Deutschland Gmbh Transponder-Backscatter-Modulator mit geregelter Modulationstiefe
DE102007046980A1 (de) * 2007-09-28 2009-05-14 Siemens Ag Übertragung von Daten zwischen einem elektrischen Verbraucher und einem Betriebsmittel
FR2939580A1 (fr) * 2008-12-09 2010-06-11 Commissariat Energie Atomique Objet portatif couple inductivement a une station fixe et comportant des moyens de controle du gain
US8076970B2 (en) * 2009-06-10 2011-12-13 Infineon Technologies Ag Adaptive demodulator
KR20120120330A (ko) 2010-01-29 2012-11-01 가부시키가이샤 한도오따이 에네루기 켄큐쇼 반도체 장치
JP2012110085A (ja) * 2010-11-15 2012-06-07 Sanyo Electric Co Ltd 電池内蔵機器及び電池内蔵機器と充電台
FR2992123A1 (fr) * 2012-06-13 2013-12-20 St Microelectronics Rousset Gestion d'energie dans un transpondeur electromagnetique
JP6178424B2 (ja) 2012-11-14 2017-08-09 ヴェクトリアス メディカル テクノロジーズ リミテッド 埋め込み型静電容量ベース圧力変換器のためのドリフト補償
US10205488B2 (en) 2013-04-18 2019-02-12 Vectorious Medical Technologies Ltd. Low-power high-accuracy clock harvesting in inductive coupling systems
EP2986252B1 (en) 2013-04-18 2018-07-25 Vectorious Medical Technologies Ltd. Remotely powered sensory implant
CN103714378B (zh) * 2014-01-08 2016-09-07 卓捷创芯科技（深圳）有限公司 一种无源射频标签的智能化能量管理系统与能量管理方法
CN103679259B (zh) * 2014-01-08 2016-08-17 卓捷创芯科技（深圳）有限公司 一种具有多种时间常数的整流限幅电路和无源射频标签
US9906064B2 (en) * 2014-09-22 2018-02-27 Qualcomm Technologies International, Ltd. Receiver circuit
EP3398237B1 (en) 2015-12-30 2020-12-02 Vectorious Medical Technologies Ltd. Power-efficient pressure-sensor implant
US10043124B2 (en) * 2016-12-15 2018-08-07 Em Microelectronic-Marin Sa Voltage regulation circuit for an RFID circuit
WO2019220232A1 (en) * 2018-05-17 2019-11-21 Vectorious Medical Technologies Ltd. Low-power high-accuracy clock harvesting in inductive coupling systems
US11205106B2 (en) * 2019-09-19 2021-12-21 Sensormatic Electronics, LLC Self-detaching anti-theft device with energy limit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005504A1 (fr) * 1995-08-02 1997-02-13 Em Microelectronic-Marin S.A. Dispositif d'interface radiofrequence pour transpondeur

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3068745B2 (ja) * 1994-05-27 2000-07-24 ローム株式会社 高周波タグおよびこれを利用した情報交換システム
US3299421A (en) 1963-10-31 1967-01-17 Texas Instruments Inc Analog-digital encoder for timevarying signals
GB1577920A (en) 1976-11-01 1980-10-29 Nedap Nv Detection plate for identification systems
GB8509135D0 (en) * 1985-04-10 1985-05-15 Gen Electric Co Plc Transaction system
GB2176327B (en) 1985-06-05 1988-06-29 John Jones Identification system
FR2623311B1 (fr) 1987-11-18 1991-05-17 Izadnegahdar Ali Systeme d'identification a interrogation sans contact d'une etiquette electronique
US5302954A (en) 1987-12-04 1994-04-12 Magellan Corporation (Australia) Pty. Ltd. Identification apparatus and methods
AT395224B (de) * 1990-08-23 1992-10-27 Mikron Ges Fuer Integrierte Mi Kontaktloses, induktives datenuebertragungssystem
JPH05135226A (ja) * 1991-11-12 1993-06-01 Hitachi Maxell Ltd 非接触型情報媒体
US5479172A (en) * 1994-02-10 1995-12-26 Racom Systems, Inc. Power supply and power enable circuit for an RF/ID transponder
JPH0962816A (ja) * 1994-10-06 1997-03-07 Mitsubishi Electric Corp 非接触ｉｃカードおよびこれを含む非接触ｉｃカードシステム
ATA91895A (de) * 1995-05-31 1997-11-15 Mikron Ges Fuer Integrierte Mi Versorgungsspannungsaufbereitungsschaltung sowie datenträger mit einer versorgungsspannungsaufbereitungsschaltung
US5960207A (en) * 1997-01-21 1999-09-28 Dell Usa, L.P. System and method for reducing power losses by gating an active power factor conversion process
JP3873350B2 (ja) * 1997-02-17 2007-01-24 凸版印刷株式会社 非接触ｉｃカード
US6747548B1 (en) * 1997-06-18 2004-06-08 Mitsubishi Denki Kabushiki Kaisha Non-contact IC card system and non-contact IC card

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005504A1 (fr) * 1995-08-02 1997-02-13 Em Microelectronic-Marin S.A. Dispositif d'interface radiofrequence pour transpondeur

Also Published As

Publication number Publication date
DE69933405T2 (de) 2007-08-16
JP4584373B2 (ja) 2010-11-17
EP0947951A1 (fr) 1999-10-06
FR2776865A1 (fr) 1999-10-01
FR2776865B1 (fr) 2000-05-05
US6778070B1 (en) 2004-08-17
JP2000004189A (ja) 2000-01-07
DE69933405D1 (de) 2006-11-16

Similar Documents

Publication Publication Date Title
EP0947951B1 (fr) Dispositif de télétransmission par couplage inductif
EP1301898B1 (fr) Transpondeur passif a faible consommation
EP1617550B1 (fr) Circuit d'alimentation adaptable
EP2443594B1 (fr) Gestion de puissance dans un transpondeur electromagnetique
EP0762308B1 (fr) Installation pour l'échange d'informations à distance entre un objet portatif passif et une station, objet et station correspondants
EP2267642B1 (fr) Evaluation inductive du facteur de couplage d'un transpondeur électromagnétique
EP2507739B1 (fr) Prolongateur d'antenne rfid auto-parametrable
EP2114019B1 (fr) Recharge d'un transpondeur actif
EP2067115A1 (fr) Procede et systeme de lecture optimisee de transpondeur de communication radio frequence a l'aide d'un circuit resonant passif
EP3413473B1 (fr) Procédé de contrôle du niveau de puissance émise par un dispositif de communication sans contact, par exemple un lecteur, et dispositif de communication sans contact correspondant
EP2070018B1 (fr) Dispositif d'identification par radio fréquence (rfid) apposé sur un objet à identifier
EP1164535B1 (fr) Dispositif de production d'un champ électromagnétique pour transpondeur
EP2509227B1 (fr) Procede d'adaptation automatique d'impedance de circuit radiofrequence et chaîne d'emission ou reception modulaire
EP1068652B1 (fr) Dispositif de controle de l'impedance ramenee sur l'antenne d'une etiquette electronique
EP1043679A1 (fr) Lecteur avec des moyens pour déterminer la distance entre ce lecteur et un transpondeur
EP1087332B1 (fr) Transpondeur destiné à plusieurs applications différentes
WO2004093341A1 (fr) Dispositif et teletransmission par couplage inductif a modulation multi-niveaux
WO2005029726A1 (fr) Objet portatif à démodulation multiniveaux, couplé inductivement à une station fixe
EP0777193B1 (fr) Circuit d'alimentation et de modulation pour une étiquette interrogeable à distance
EP4109772A1 (fr) Alimentation d'un dispositif électronique
FR2835119A1 (fr) Demodulateur a large dynamique pour cartes a puce ou etiquettes sans contact
EP2826156B1 (fr) Systeme de communication sans fil a plusieurs recepteurs multiplexes
FR3148121A1 (fr) Dispositif de communication et de chargement sans fil
EP1093636A1 (fr) Interface analogique pour circuit d'echange d'informations autonome
EP1039408A1 (fr) Telealimentation d'un transpondeur électromagnétique

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES GB IT

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20000313

AKX Designation fees paid

Free format text: DE ES GB IT

17Q First examination report despatched

Effective date: 20041216

APBN Date of receipt of notice of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA2E

APBR Date of receipt of statement of grounds of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA3E

APBV Interlocutory revision of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNIRAPE

APAO Information on interlocutory revision modified

Free format text: ORIGINAL CODE: EPIDOSCIRAPE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES GB IT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20061004

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: COMMISSARIAT A L'ENERGIE ATOMIQUE

REF Corresponds to:

Ref document number: 69933405

Country of ref document: DE

Date of ref document: 20061116

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070115

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20070131

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070705

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20150311

Year of fee payment: 17

Ref country code: IT

Payment date: 20150325

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20150316

Year of fee payment: 17

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69933405

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20160329

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161001

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160329

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160329